Help to find IAP_SHADELESS
It's a custom Group created by the add-on &quot;Import-Export: Import Images as Planes&quot;. (IAP = Images As Planes)
Go to Edit &gt; Preferences &gt; Add-ons, search for &quot;Images&quot; and tick the checkbox to enable the &quot;Import-Export: Import Images as Planes&quot; add-on.

Now you can use the add-on through File &gt; Import &gt; Images as Planes (or through the Add menu in the 3D View). Select an image to import and pick &quot;Shadeless&quot; under the Material Settings. Then hit import.

Your image will be imported as a quad. The material it uses will have the IAP_SHADELESS node.
After you've done this once in a file, you can add the group to any material you want by picking Add &gt; Group &gt; IAP_SHADELESS in the Shader Editor.